llvm-project

Author	SHA1	Message	Date
Lei Huang	168d14b143	[PowerPC] Reduce register pressure by not materializing a constant just for use as an index register for X-Form loads/stores. For this example: float test (int *arr) { return arr[2]; } We currently generate the following code: li r4, 8 lxsiwax f0, r3, r4 xscvsxdsp f1, f0 With this patch, we will now generate: addi r3, r3, 8 lxsiwax f0, 0, r3 xscvsxdsp f1, f0 Originally reported in: https://bugs.llvm.org/show_bug.cgi?id=27204 Differential Revision: https://reviews.llvm.org/D35027 llvm-svn: 307553	2017-07-10 16:44:45 +00:00

Author

SHA1

Message

Date

Lei Huang

168d14b143

[PowerPC] Reduce register pressure by not materializing a constant just for use as an index register for X-Form loads/stores.

For this example:
float test (int *arr) {
    return arr[2];
}

We currently generate the following code:
  li r4, 8
  lxsiwax f0, r3, r4
  xscvsxdsp f1, f0

With this patch, we will now generate:
  addi r3, r3, 8
  lxsiwax f0, 0, r3
  xscvsxdsp f1, f0

Originally reported in: https://bugs.llvm.org/show_bug.cgi?id=27204
Differential Revision: https://reviews.llvm.org/D35027

llvm-svn: 307553

2017-07-10 16:44:45 +00:00

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